The greatest HT-AVR Transformer Manufacturers in India are widely recognized as being Mahendra Transformers. In essence, HT Automatic Voltage Regulators is another name for HT AVRs. It is also marketed as HT Automatic Voltage Stabilizers in several regions of India and other countries. The HT AVR's primary functions are to control and filter the fluctuations. prior to feeding the transformer with them. The two connected tanks are the essential component of an HT-Automatic Voltage Regulator. One is a housing distribution device called a buck-book transformer.